<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <input type="checkbox" v-model="checkState">
    </div>
    <script>
        var vm = new Vue({
            el:"#app",
            data:{
                checked:false
            },
            computed:{
                checkState:{
                    get(){
                        return this.checked
                    },
                    set(val){
                        console.log(val)
                        //改变它的依赖不能直接改变值
                        this.checked = val
                    }
                }
            }
        })

        class Person{
            value = "html"
            get val(){
                return this.value;
            }
            set val(value){
                this.value = value
            }
        }
        var p = new Person("cheng",18);
        p.val = "good"; //调用set方法
        console.log(p)
    </script>
</body>
</html>